There are two colleges for pursuing MBA in Manipal. TAPMI is one of the top rated MBA colleges in India and the main basics of admission is your percentile in the CAT exam, profile and any job experience. They usually prefer students with job experience.
If you are into MBA program in SOM (School of Management) which is under manipal university, initially you will have to apple through their online portal or you can collect forms from som and fill up and submit, you will have to put you MAT, CAT, XAT score in the application form if you have not written any of the entrance and have applied for it, you will have to put the entrance exam application number in the form and then apply. After your mat, cat or xat results are out, and if you are selected you will receive a mail from the college admission department asking you to attend a Group Discussion and Personal interview process ones you are done with it and if you are selected in it you will receive a mail from manipal university admission department informing you the same.